Comparison of sequential and single extraction in order to estimate the environmental impact of metals from fly ash
AuthorsTasić, Aleksandra M.
Ignjatović, Ljubiša M.
Ilić, Marija A.
Article (Published version)
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The aim of this paper is to simulate leaching of metals from fly ash in different environmental conditions using ultrasound and microwave-assisted extraction techniques. Single-agent extraction and sequential extraction procedures were used to determine the levels of different metals leaching. The concentration of metals (Al, Fe, Mn, Cd, Co, Cr, Ni, Pb, Cu, As and Be) in fly ash extracts were measured by inductively coupled plasma-atomic emission spectrometry. Single-agent extractions of metals were conducted at sonication times of 10, 20, 30, 40 and 50 min. Single-agent extraction with deionized water was also performed by exposing samples to microwave radiation at temperature of 50 degrees C. The sequential extraction was conducted according to the BCR procedure which was modified and applied to study the partitioning of metals in coal fly ash. The microwave-assisted sequential extraction was performed at different extraction temperatures: 50, 100 and 150 degrees C. The partitioning ...of metals between the individual fractions was investigated and discussed. The efficiency of the extraction process for each step was examined. In addition, the results of the microwave-assisted sequential extraction are compared to the results obtained by standard ASTM method. The mobility of most elements contained in the fly ash is markedly pH sensitive.
Keywords:coal fly ash / single-agent extraction / sequential extraction / microwaves / ultrawaves
Source:JOURNAL OF THE SERBIAN CHEMICAL SOCIETY, 2016, 81, 9, 1081-1096
- Srpsko hemijsko društvo, Beograd
Funding / projects:
- Application of advanced oxidation processes and nanostructured oxide materials for the removal of pollutants from the environment, development and optimisation of instrumental techniques for efficiency monitoring (RS-172030)
- Geochemical investigations of sedimentary rocks - fossil fuels and environmental pollutants (RS-176006)
- Advanced technologies for monitoring and environmental protection from chemical pollutants and radiation burden (RS-43009)